Update README.md

Author: DanielSSilva

README.md

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-# Powershell_IoT_IS31FL3730-Driver
+# Powershell_IoT_IS31FL3730-Driver
+
+This repository has as main objective, replicate the [pimoroni's IS31FL3730 driver](https://github.com/pimoroni/scroll-phat/blob/master/library/scrollphat/IS31FL3730.py) to the PowerShell environment, using [PowerShell-IoT](https://github.com/PowerShell/PowerShell-IoT).